President Vladimir Putin has insisted Russian forces were in the right to seize three Ukrainian ships last weekend, but President Donald Trump expressed "deep concern" at Moscow's actions against a U.S. ally.

"It is undoubtedly a provocation", the Russian president said, adding that it had been organised by Ukraine's authorities "and, I think, the incumbent president in the run-up to the Ukrainian presidential election in March 2019".

Britain, Poland, and the Baltic States have urged other members of the European Union 28 to impose extra measures when existing sanctions against Russian Federation are renewed in December. "It was used as a pretext to introduce martial law".

Speaking in northern Ukraine, Poroshenko, who has accused Moscow of naked military aggression, talked up his country's readiness to respond to any future Russian military action.

"These territorial waters were always ours, even before Crimea joined Russia", Mr Putin said, referring to Moscow's 2014 annexation of the peninsula.

It has raised fears of a wider escalation - in a conflict that has killed more than 10,000 people since 2014 - and prompted global calls for restraint.

A Kremlin aide said on Wednesday that Putin had rebuffed an initiative from Poroshenko for the two men to speak by phone.

A division of S-400 Triumph surface-to-air missiles will be sent to Crimea for "combat duty", the state-backed Tass news agency reported Wednesday, citing information provided by the Southern Military District's press service.

Sputnik News, another Russian media outlet owned by the Russian government, indicated that this would be the fourth S-400 air-defence battalion the country deployed to Crimea.

The deployment is likely to have been long-planned, but the timing of the announcement appeared created to send a message to Ukraine and the West that Russian Federation is serious about defending what it regards as its own territory and waters.

Trump said he would be receiving a "full report" from his national security team on Russia's recent actions in eastern Ukraine and the Black Sea.

Kiev published a map on Wednesday showing the place of the standoff, which caused a crash, seizure of all three Ukrainian vessels, and the capture of 24 Ukrainian crew members. The same court ordered the other 15 sailors on Tuesday to be detained for two months pending a possible trial.

Ukraine says Russian Federation is deliberately blockading Mariupol and another port, Berdyansk, preventing ships from getting through the Kerch Strait.

Western governments have rallied behind Kiev in the dispute, accusing Russian Federation of illegally blocking access to the Sea of Azov and of taking military action without justification.

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